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Ectopic eruption of the maxillary second molar: Predictive factors
The Angle Orthodontist
|May 4, 2017
Summary
Ectopic eruption of maxillary second molars is linked to wider teeth, longer arches, and specific jaw angles. Increased arch length and decreased ANB angle and PTV-M1 distance are key predictive factors.
Area of Science:
- Orthodontics
- Dental Morphology
- Predictive Diagnostics
Background:
- Ectopic eruption of maxillary second molars presents diagnostic challenges.
- Identifying contributing conditions and predictive factors is crucial for timely intervention.
Purpose of the Study:
- To investigate diagnostic aspects of ectopic eruption of maxillary second molars.
- To identify contributing conditions and predictive key factors.
Main Methods:
- Retrospective study of 80 adult subjects (40 ectopic, 40 normal eruption).
- Evaluation of dental models, lateral cephalographs, and panoramic radiographs.
- Statistical analysis including t-tests, logistic regression, and ROC analysis.
Main Results:
- Wider tooth widths and greater arch lengths observed in the ectopic group.
- Smaller ANB angle and maxillary tuberosity distances (PTV-M1, PTV-M2) in the ectopic group.
- Multivariate analysis identified arch length, ANB angle, and PTV-M1 distance as significant predictors (AUC > 0.75).
Conclusions:
- Increased arch length, decreased ANB angle, and decreased PTV-M1 distance are significant predictors of ectopic eruption.
- These factors aid in the early diagnosis and management of ectopic eruption.
